Pipe-threading tool.



B. BORDEN.

PIPE THREADING TOOL.

APPLIOATION FILED MAY 5. 1910.

1,0 9,331, Patented Aug. 5, 1913.

I 2 SHEETS-SHEET 1.

WWW 4 Bingo/Q6 BOid Z/.

COLUMBIA PLANDGRAFH c0..wAsM|N c.

a Ho man;

B. BURDEN.

PIPE THREADING TOOL.

APPLIOATION FILED MAY 5, 1910.

1,069,381 Patented Aug. 5, 1913.

2 SHEETS-SHEET 2.

c AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA c.

UNITED STATES PATENT onnron.

BRADFORD BORDEN, OF TORONTO, ONTARIO, CANADA, ASSIGNOR TO THE BORDENCOMPANY, OF WARREN, OHIO, A CORPORATION OF OHIO.

PIPE-THREADING TOOL.

T 0 all whom it may concern:

Be it known that I, BRADFORD BORDEN, of Toronto, in the Province ofOntario, Dominion of Canada, have invented certain new and usefulImprovements in Pipe- Threading Tools; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

In the art of pipe threading tools difliculty has always beenexperienced in the use of work-holders by which the tools are mounted onthe exterior of the pipe to be threaded, and which work-holders haveusually embodied leader screws for drawing the chasers on and over thepipe. Grit and dirt frequently strip the threads of the leader screwsand greatly shorten the life of the tool. In some instances it has beensought to inclose the leader screw to prevent the entrance of grit anddirt, but all such means have but added to the cost of construction andweightof the tool, and have not proved of much value. It has also beensought to minimize the difiiculties by providing the work-holders withmeans for merely initiating the engagement of the dies or chasers withthe pipe, but such means has required the use of chasers of specialformation, and even then the engagement of the chasers with the pipe hasbeen attended with considerable difficulty. Furthermore, such lattermeans has required the employment of special parts which have tended toincrease the cost and add materially to the weight of the tool.

In the class of tools for cutting tapered threads, that is, thosewherein the dies or chasers gradually recede as the cutting operationprogresses, in order to secure a range of adjustment for pipes ofdifferent sizes the use of two plates has heretofore been necessary, oneplate being in engagement wit-h the chasers and the other plate with thecontrolling element by which the former plate is controlled in effectingthe recession of the chasers. The use of a second plate not onlyincreases the number of parts, and adds to the cost, but a stock soequipped is open to the further objection that grit and dirt enteringbetween the plates will interfere with the free operation thereof,resulting in premature wear.

The object of the present invention is to Specification of LettersPatent.

Application filed May 5, 1910.

Patented Aug. 5,1913.

Serial No. 559,444.

produce a thread cutting tool of the same general character as aboveoutlined which will dispense not only with a work-holder, but also witha second plate cooperating with the cam plate to permit the chasers tobe set for pipes of different sizes, and which tool will possess all theadvantages and none of the disadvantages which might be urged againsttools having work-holders or two cooperating plates, thus simplifyingthe construction and operation, and reducing the cost of manufacture.

The invention will be hereinafter fully set forth and particularlypointed out in the claims. In the accompanying drawings, Figure 1 1s anend elevation. Fig. 2 is a side view. Fig. 3 isa similar view, but atright angles to Fig. 2. Figs. 4 and 5 show a slight modification. Fig. 6is a detached view in perspective.

Referring to the drawings, 1 designates, the housing or chaser-carrier;2 a series of radially arranged chasers; 3 a rotatable cam platemountedon the chaser-carrier whereon itis held by a nut 4. The cam platehas on its inner face a series of eccentric grooves '55 for taking inlugs 6 of the several chasers, and in its periphery it has a series ofcutcuts or recesses '7 in any one of which is designed to fit a lug 8which extends diagonally across the faceof a post 9 by which it iscarried. The number of cut-outs is regulated by the capacity of thetool. The lug 8 may be moved transversely of the post to set the chasersfor cutting under or over standard. In Figs. 1, 2 and 8, I have shownthe lug as detachably held to the face of the post by a binding screw10, the head of which has a handle 12. This screw is passed through anelongated opening in the post to permit the lug to be movedtransversely. The lug is shown in these figures as having a flattenedbase which fits against the grooved face of the post to form a firmbearing for the lug. If desired, however, the same result may be securedby making the post in two parts, as shown in Figs. 4t and 5, andmounting the lug on the outer part 13 and have it project through anopening in the inner part, said outer part being shown as pivoted at itsinner or rear end to the main part of the post, and as held thereto'by abinding screw 10". This second part is shown as having an outwardlyprojecting handle 1 1-. To set the chascrs for cutting under or overstandard, the necessary adjustment is obtained by turning binding screw10, and when it is desired to manually adjust the chasers, for pipes ofdifferent sizes, the part 13 of the post is swung outwardly on its pivotto disengage the lug from the cam plate, whereupon the latter may beturned axially.

Regardless of which form is used, the diagonally-arranged lug of thepost constitutes the element for controlling the independent rotation ofthe cam plate, and thereby gradual recession of the ehasers. Theinterlocking engagement of the lug with the cam plate will cause orpermit the rotation of the latter. The post projects through an openingin the chaser-carrier, and at its outer end is connected to a cross bar15, the same as in my first two before-noted applications for patents.This bar extends transversely across the face of the chaser-carrier, andat its opposite end has a guide post 16 which likewise projects throughan opening in the chaser-carrier. According to the preferred form, whenthe chasers are to be ad justed for pipes of different sizes, theoperator draws outwardly on the cross-bar until the lug of the post isfree of the cam plate, allowing the latter to be freely turned to alineany one of the grooves with the lug, whereupon the cross-bar is movedinwardly to cause the lug to enter such groove. To the center of thecross-bar is secured a stop 17 which projects into the central openingof the housing so as to be engaged by the end of the pipe, with theresult that the pressure of the latter, acting through the cross-bar,holds the post from traveling longitudinally with the chaser-carrierduring the threading operation. I prefer to have the inner end of thestop 17 extend into the chaser-carrier to a point intermediate the innerand outer ends of the threaded portions of the chasers, as pointed outin my application for patentfiled December 7, 1909, so that the relativemovement between the chaser-carrier and the cross-bar and lug carryingpost will not begin until the chasers have taken hold of the pipe.

The chaser-carrier is shown as having sockets 18 for the customaryhandles by which it may be manipulated. During the threading operationthe cam plate not only rotates with the chaser-carrier, but it has amovement independently thereof which is controlled by the lugcarryingpost, and. it is this independent movement which effects the gradual anduniform recession of the ehasers.

The advantages of my present invention are apparent to those skilled inthe art.

It will be seen that the number of parts is greatly reduced, therebylessening the danger of injury by grit or dirt; also that the chasersare positively controlled regardless of the condition of the pipe metal;and that they may be readily and easily set for threading pipes ofdifferent sizes, and are capable of additional adjustment for under orover cutting.

I claim as my invention 1. In a pipe threading tool, the combinationwith a chaser-carrier, a series of radially-arranged chasers, and achaser-engaging plat-e rotatable with, and also relatively to, thechaser-carrier, of a post rotatable with said chaser-carrier and betweenwhich latter and Said post there is a relative longitudinal movementduring the cutting operation, and means adjustable on said post forinterlocking with said plate for controlling the rotation thereofindependently of the chaser-carrier.

2. In a pipe threading tool, the combination with a chaser-carrier, aseries of radially-arranged chasers, and a chaser-engaging platerotatable with, and also relatively to, the chaser-carrier, of a postrotatable with said chaser-carrier and between which latter and saidpost there is a relative longitudinal movement during the cuttingoperation, said chaser-engaging plate having cutouts in its periphery,and a diagonallyarranged lug mounted on said post for entering any oneof said cut-outs.

3. In a pipe threading tool, the combination with a chaser-carrier, aseries of radiaally-arranged chasers, and a chaser-engaging platerotatable with, and also relatively to, the chaser-carrier, of a postrotatable with said chaser'carrier and between which latter and saidpost there is a relative longitudinal movement during the cuttingoperation, said chasenengaging plate having cut-outs in its periphery,and an adjustable diagonally-arranged lug carried by said post forentering any one of said cut-outs.

4:. In a pipe threading tool, the combination with a chaser-carrier, aseries of radially-arranged chasers, and a chaser-engag ing platerotatable with, and also relatively to, the chaser-carrier, of a postrotatable with said chaser-carrier and between which latter and saidpost there is a relative longitudinal movement during the cuttingoperation, said chaser-engaging plate having cutouts in its periphery, adiagonally-arranged lug carried by said post for entering any one ofsaid cut-outs, and a binding screw for adjustably holding said lug tosaid post.

5. In a pipe threading tool, the combination wit-h a chaser-carrier, aseries of radially-arranged chasers, and a chaser-engaging platerotatable with, and also relatively to, the chasercarrier, of meansrotatable with the chaser-carrier and between which and saidchaser-carrier there is a relative longitudinal movement during thecutting operation, such means directly engaging said chaser-engagingplate for causing the rotation thereof independently of thechasercarrier, a support for such means extending transversely of thechaser-carrier, and a stop carried by said support to be engaged by thepipe to be threaded, such engagement resulting in the relativelongitudinal movement between said means and the chasercarrier.

6. In a pipe threading tool, the combination with a chaser-carrier, aseries of radially-arranged chasers, and a chaser-engaging laterotatable with, and also relatively to, tie chaser-carrier, of a postrotatable with said chaser-carrier and between which latter and saidpost there is a relative longitudinal movement during the cuttingoperation, means adjustable on said post for interlocking with saidplate for controlling the rotation thereof independently of thechaser-carrier, a cross-bar extended transversely of the chaser-carrierand to which said post is connected, and a stop carried by saidcross-bar and extending into the chassr-carrier to engage the pipe to bethreaded.

7. In a pipe threading tool, the combination with a chaser-carrier, aseries of radially-arranged chasers, and a chaser-engaging platerotatable with, and also relatively to, the chaser-carrier, of a postrotatable with said chaser-carrier and between which latter and saidpost there is a relative longitudinal movement during the cuttingoperation, said chaser-engaging plate having cutouts in its periphery, adiagonally-arranged lug adjustably mounted on said post for entering anyone of said cut-outs, and a stop connected to said post and extendinginto the chaser-carrier to engage the pipe to be threaded.

8. In a pipe threading tool, the combination with a chaser-carrier, aseries of: radially-arranged chasers, and a chaser-engaging platerotatable with, and also relatively to, the chaser-carrier, of a postrotatable with said chaser-carrier and between which latter and saidpost there is a relative longitudinal movement during the cutting op- SV eration, said chaser-engaging plate having cut-outs in its periphery,a diagonally-arranged lug carried by said post for entering any one ofsaid cut-outs, means for adjustably holding said lug to said post, acrossbar extended transversely of the chaser-carrier and to which saidpost is connected and a stop carried by said cross-bar and extendinginto the chaser-carrier to engage the pipe to be threaded.

In testimony whereof, I have signed this specification in the presenceof two subscribing witnesses.

BRADFORD BORDEN. WVitnesses E. MERNER, I-I. OHRISTMAN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents Washington, D. G.

